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Load distribution of multiple disks

a technology of multiple disks and load distribution, applied in the direction of memory address formation, micro-instruction address formation, allocation/relocation, etc., can solve the problems of performance impediment and failure to deliver fault toleran

Inactive Publication Date: 2007-10-11
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution enables almost instantaneous data access and continuous availability by distributing I / O read requests across multiple physical storage areas, reducing bottlenecks and enhancing fault tolerance, allowing for simultaneous handling of multiple requests.

Problems solved by technology

This improves performance, but does not deliver fault tolerance.
While these techniques operate well to provide a measure of fault tolerance and, therefore, some continuous availability of the stored data, they can be overloaded when facilities employing these techniques must respond to a large volume of requests for data.
Thus, although continuous availability is now a feature of many database complexes and data warehouse configurations, they still can present a performance impediment by limiting the number of accesses that can be made at any particular moment in time.

Method used

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  • Load distribution of multiple disks
  • Load distribution of multiple disks
  • Load distribution of multiple disks

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] Turning now to the Figures, and for the moment specifically FIG. 1, there is illustrated a storage system, designated generally with the reference numeral 10 for handling I / O data communication between a number of host systems 12 (121, 122, . . . , 12k) and a physical storage 14, comprising disk units 16 (161, 162, . . . , 16n). The storage system 10 includes a controller unit 20, with associated memory / cache unit 22, operating to control data transfers between the host system 12 and the physical storage 14 (i.e., disk storage units 16). The controller 20 is preferably implemented by a number of individual processor elements (e.g., microprocessors) or similar devices in order to provide parallel processing, so that multiple different processes can be running simultaneously. For example, the controller 20 may utilize a symmetric multiprocessing (SMP) architecture to exploit the power of multiple processor units through distribution of the operating system to thereby balance th...

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PUM

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Abstract

A storage system stores multiple copies of data on physical storage implemented, for example, with multiple disk units. Input / output read requests are received from host systems and distributed in a manner that allows parallel read operations to be conducted over the multiple disk units of the physical storage.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application is a Continuation Application of application Ser. No. 10 / 799,013, filed Mar. 11, 2004, which is a Continuation Application of application Ser. No. 09 / 813,382, filed Mar. 20, 2001, which is a Continuation-in-part of application Ser. No. 09 / 619,000, filed Jul. 18, 2000, now U.S. Pat. No. 6,631,443, which is a Continuation Application of application Ser. No. 09 / 116,344, filed Jul. 16, 1998, now U.S. Pat. No. 6,108,750, which is a Continuation of application Ser. No. 08 / 868 / 075, filed Jun. 3, 1997, now U.S. Pat. No. 5,835,938, which is a Continuation Application of application Ser. No. 08 / 355,274, filed Dec. 12, 1994, now U.S. Pat. No. 5,680,574, which is a Continuation Application of application Ser. No. 07 / 648,998, filed Jan. 31, 1991, now abandoned. The disclosure of the aforementioned U.S. application Ser. No. 09 / 619,000 (hereinafter, “Referenced Application”) is hereby incorporated by reference as if fully set forth h...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F12/00G06F3/06G06F11/20G06F12/08
CPCG06F3/061G06F2212/262G06F3/0617G06F3/0635G06F3/065G06F3/0659G06F3/0665G06F3/0683G06F3/0689G06F11/2058G06F11/2087G06F12/0804G06F12/0866G06F12/0868G06F3/0613
Inventor YAMAMOTO, AKIRASATOH, TAKAOHONMA, SHIGEOASAKA, YOSHIHIROKUWAHARA, YOSHIAKIKITAJIMA, HIROYUKI
Owner HITACHI LTD